444 results about "Polymer particle" patented technology

The invention relates to an epoxy core-shell polymer particle and resin, a preparation method of the epoxy core-shell polymer particle and resin and application of the epoxy core-shell polymer particle and resin to epoxy resin. The preparation method of the epoxy core-shell polymer particle comprises the following steps: heating and mixing a polybutadiene seed emulsion, a reducing agent, an emulsifier and the like; adding methyl methacrylate and an initiator, and glycidyl methacrylate and an initiator, and heating to react; compared with the prior art, the core-shell particle with the outer layer of the synthesized shell containing the epoxy group can be used for toughening the epoxy resin, so that the toughness of the epoxy resin is effectively improved while the excellent heat resistance and mechanical properties of the epoxy resin are maintained.

A method of three-dimensional printing can include iteratively applying a polymer build material as individual layers to a powder bed, where the polymer build material includes from about 80 wt % to 100 wt % polymeric particles, and based on a three-dimensional object model, selectively applying a coalescing agent onto individual layers of the polymer build material. The coalescing agent can include an aqueous liquid vehicle and a coalescing solvent that depresses a melting point of the polymeric particles. The method can include exposing the powder bed to heat to selectively coalesce portions of individual layers of the polymer build material in contact with the coalescing solvent. The heat may not be sufficient to coalesce the polymer build material that is not in contact with the coalescing solvent and may be sufficient to fuse the polymeric particles in contact with the coalescing solvent together to form a three-dimensional object.

The invention provides a non-fluoropolymer, a non-fluoropolymer composite diaphragm and application, the non-fluoropolymer comprises a polymer A and a polymer B at least partially coating the surface of the polymer A, the crosslinking degree of the polymer A is X1, the crosslinking degree of the polymer B is X2, 5% < = X1 < = 10%, and 50% < = X2 < = 60%; the non-fluorine polymer composite diaphragm comprises a base membrane and a coating layer coated on at least one side of the base membrane. The non-fluorine polymer particles have high swelling rate at high temperature and reversible characteristics of absorbing and releasing electrolyte, when the non-fluorine polymer and the non-fluorine polymer composite diaphragm are applied to a battery cell, when the battery cell is heated abnormally, the non-fluorine polymer swells at high speed and blocks an ion shuttle channel, further temperature deterioration is avoided, and the service life of the battery cell is prolonged. Meanwhile, when the temperature returns to normal, the non-fluorine polymer particles can recover to the original morphology and recover an ion shuttle channel, so that the subsequent cycle performance of the battery cell is not influenced.

The invention discloses a polymer foamed sheet as well as a preparation method and application thereof, and relates to the technical field of foamed materials. According to the preparation method of the polymer foamed sheet provided by the invention, firstly, the polymer particles with specific morphology are mixed, hot pressed and sintered to obtain the sheet with certain porosity, and then the sheet is foamed and sintered to form pores in the sheet, so that diffusion of supercritical fluid is accelerated; according to the preparation method, rapid and efficient preparation of the polymer foamed board can be achieved, the obtained foamed polymer board has abundant foam holes with high uniformity in size and distribution, the foaming ratio can reach 8.3 times or above, the density is low, the light weight characteristic is excellent, the large-scale application prospect is achieved, meanwhile, the good heat insulation characteristic is achieved, and the application prospect is wide. The heat conductivity coefficient is not higher than 0.09 W m <-1 > K <-1 >.

The invention discloses a bio-based polymer emulsion as well as a preparation method and application thereof, and belongs to the technical field of aqueous polymer emulsions. The emulsion comprises an aqueous continuous phase, bio-based polymer particles, a stabilizing system, and a bionic catechol adhesion component. Specific modified starch is innovatively utilized for assistance, and a bionic adhesion shell layer is constructed on the surface of a bio-based polymer core in situ. Compared with similar products in the market that adhesion to inert substrates can be improved only by adding a large amount of tackifying components, the scheme has the advantages that excellent dry and wet adhesion can be realized on the surfaces of difficult-to-adhere substrates such as polypropylene and polyethylene only by constructing an extremely thin interface functional layer, and the functionalization efficiency and economical efficiency of the bio-based material are greatly improved. Meanwhile, the system effectively overcomes the industrial problem that the high-solid-content emulsion is easy to settle, has excellent storage stability and construction adaptability, and conforms to the development trend of sustainable barrier packaging and high-performance water-based coatings in the future.

The invention relates to the technical field of MBS resin preparation, in particular to MBS resin with improved low-temperature tensile strength and a preparation method thereof. The MBS resin for improving the low-temperature tensile strength is prepared from the following main raw materials: butadiene, styrene, methyl methacrylate, butyl acrylate, N-phenylmaleimide, BAPT, a silane coupling agent and an auxiliary reinforcing monomer, the composition also comprises the following auxiliary agents: an emulsifier, an initiator, a molecular weight regulator and an antioxidant. Through gradient introduction and step-by-step reaction of a rigid monomer N-PMI, a flexible monomer THFA and a cross-linking agent BAPT, a fine structure of'in-core rigidity increasing, shell layer rigidity and softness and interface strengthening 'is realized in polymer particles. By means of the collaborative structure from inside to outside, optimal distribution of rigidity and toughness of the material on the molecular level is achieved in advance, and the root reason for breaking through the low-temperature performance balance bottleneck macroscopically is achieved.

To provide a group of polyorganosiloxane-containing polymer particles that yield molded articles with excellent impact strength. [Solution] A polyorganosiloxane-containing polymer particle group according to one aspect of the present invention comprises a polymer (A) containing a polyorganosiloxane (A1) and a first vinyl polymer (A2), and a second vinyl polymer (B). When the cross-section of a resin piece obtained by dispersing the polyorganosiloxane-containing polymer particle group in a resin is observed with a transmission electron microscope, the ratio of the number of particles satisfying the following formula (1) is less than 60%, where L is the diameter of each particle in the polyorganosiloxane-containing polymer particle group and M is the maximum domain length of the polyorganosiloxane (A1). M / L>0.1 ···(1)

The disclosure relates to microparticles and nanoparticles comprising a polymer matrix comprising an uncapped polymer and a net positively charged therapeutic agent at neutral pH. More particularly the disclosure relates to PLGA and / or PLA particles comprising an uncapped polymer for extended, controlled release of positively charged proteins or peptides at neutral pH. Methods of making the particles and administering the particles are also provided.

A one-component waterborne coating composition comprising: a) an aqueous dispersion of polymer particles, which polymer particles comprise an anionic-stabilized copolymer having a Mw of at least 100,000 g / mol and self cross- linking functionality, wherein the copolymer is an acrylic copolymer, an acrylic-vinyl copolymer, or a polyurethane vinyl-acrylic copolymer; and b) an organosilane; wherein: the organosilane is unreactive towards carboxylic acid functionality; and the organosilane is present in an amount of at least 5 wt.% of the total solids of the coating composition; and a coated substrate comprising a substrate and a coating, which coating is obtained by applying said coating composition to the substrate and allowing the coating composition to dry.

There is provided a method of annealing granules of a polyaryletherketone, PAEK, polymer to obtain annealed granules suitable for use in an additive manufacturing process. The method comprises: a) obtaining precursor granules of the PAEK polymer, wherein the precursor granules have a crystallinity of between about 0% and 20%, as measured by differential scanning calorimetry, DSC; and b) heating the precursor granules to an annealing temperature to thereby obtain annealed granules, wherein the annealing temperature is at least a glass transition temperature, Tg, of the PAEK polymer and at most about 50°C less than a melting temperature, Tm, of the PAEK polymer. following annealing in b), the annealed granules have a crystallinity of between about 15% and 35%, as measured by DSC, and wherein the annealing in b) increases the crystallinity of the precursor granules by at least 2%.

Provided herein are compositions comprising a particle comprising a library encoded bead (e.g., DEL bead) coated in a polymeric matrix forming a core-shell particle, wherein the core-shell particle is further inside a 3D tissue culture. Also provided herein are methods of making such particles, and methods of using such particles for drug discovery such as identification of bioactive compounds via high-throughput cellular activity-based phenotypic screens of DNA-encoded chemical library beads.

A composition comprises an aqueous dispersion of polymer particles, polymeric organic crosslinked microspheres, and colloidal silica particles. The composition is useful in coating compositions for exterior applications to achieve a balance of excellent dirt pickup resistance and durability performance under accelerated testing conditions.

This invention discloses a method for preparing a thermosensitive hemostatic gel, which is prepared by mixing a thermosensitive polymer solution with a solution of micron-sized polymer particles or microspheres with hemostatic function. The concentration of the solution of micron-sized polymer particles or microspheres with hemostatic function is 3-100 mg / mL; the concentration of the thermosensitive polymer solution is 200-450 mg / mL; the diameter of the micron-sized polymer particles or microspheres with hemostatic function is 300-900 micrometers; the gelation temperature of the thermosensitive hemostatic gel from a flowing liquid state to a solid state is greater than 15 degrees Celsius, and it is a flowing liquid state at temperatures below 15 degrees Celsius. Under the condition of warming up in response to the human body temperature, the flowing liquid hemostatic gel transforms into a solid hemostatic gel, thereby achieving the hemostatic function. The micron-sized polymer particles or microspheres in the thermosensitive hemostatic gel will not enter the damaged blood vessel during the hemostasis process.

A composite separator for a lithium secondary battery according to one aspect of the present invention comprises an inorganic heat-resistant layer and an organic polymer adhesive layer sequentially provided on at least one surface of a porous organic polymer substrate, wherein organic binder polymer particles included in the organic polymer adhesive layer are a mixture of acrylic polymer particles and vinylidene fluoride-based polymer particles, the average particle diameter (D50) of the acrylic polymer particles is 2500nm or more larger than the average particle diameter (D50) of the vinylidene fluoride-based polymer particles, the average particle diameter (D50) of the acrylic polymer particles is 3000nm or more, the average particle diameter (D50) of the vinylidene fluoride-based polymer particles is 100nm to 500nm, and the weight ratio of the acrylic polymer particles to the vinylidene fluoride-based polymer particles is 3.5:6.5 to 4.5:5.5.

The polymer particle group containing polyorganosiloxane involved in this invention comprises a polymer (A) containing polyorganosiloxane (A1) and a first vinyl polymer (A2) and a second vinyl polymer (B). When the cross-section of a resin sheet obtained by dispersing the polymer particle group containing polyorganosiloxane in a resin is observed with a transmission electron microscope, the diameter of each particle of the polymer particle group containing polyorganosiloxane is set to L, and the maximum length of the polyorganosiloxane (A1) region is set to M. The ratio of the number of particles satisfying the following formula (1) is less than 60%. M / L>0.1···(1).

The invention discloses a high and low temperature resistant epoxy resin adhesive for bonding complex components in the aerospace field and a preparation method of the high and low temperature resistant epoxy resin adhesive, relates to the field of aerospace new materials, and aims to solve the problem that an existing epoxy resin adhesive is difficult to maintain high bonding strength in a wide temperature range. Wherein the component A is prepared from liquid epoxy resin, aromatic heterocyclic epoxy resin, super-tough resin and inorganic filler; the component B is prepared from aromatic amine, modified alicyclic amine, polymer particles and a thixotropic agent. The method comprises the following steps: adding the liquid epoxy resin and the aromatic heterocyclic epoxy resin into mixing equipment for mixing, and then adding the super-tough resin and the inorganic filler for mixing to obtain a component A; aromatic amine and modified alicyclic amine are mixed, then polymer particles and a thixotropic agent are added and mixed, and a component B is obtained. According to the adhesive disclosed by the invention, the bonding strength of different materials can be kept at a high level in a temperature range of-160 DEG C to 230 DEG C. The adhesive is used for bonding complex components in the aerospace field.

The invention relates to the technical field of high polymer material synthesis, in particular to a high-strength polycarbonate resin preparation method which comprises the following steps: 1, designing a fatigue life oriented monomer ratio; step 2, gradient polymerization of phase state perception: raising the temperature to a temperature T1 corresponding to a viscosity change rate threshold in the first stage, and maintaining until the distillation rate of a byproduct reaches a safety critical value; in the second stage, variable-rate cooling is implemented based on real-time cloud point detection, an end-capping reagent is injected at the critical point temperature T2 of terminal hydroxyl concentration, and the injection rate is linked with the pressure change rate of the reaction kettle; 3, amorphous confinement solid phase tackifying: treating the polymer particles in a moving bed dynamic temperature field, wherein the temperature field range is dynamically set according to the difference value between the glass transition temperature Tg and the crystallization starting temperature Tc; and step 4, performing electric field grading relaxation. Through the technical means of multi-stage temperature control, electric field adjustment, magnetic field orientation and the like, the molecular chain structure of the resin is comprehensively optimized, and the reliability of a final product in long-term use is ensured.

The invention discloses a polymer mother liquor device capable of accelerating curing speed, and belongs to the technical field of tertiary oil recovery. The device comprises a curing tank and multiple stages of stripping plates arranged in the tank, the stripping plates comprise a first stripping plate, a second stripping plate and a third stripping plate, and the curing tank is divided into a lower cavity, a middle lower cavity, a middle upper cavity and an upper cavity in the axial direction; through holes with different diameters are formed in the stripping plates, the diameters of the through holes in the upper layer are smaller than those of the through holes in the lower layer, and the stripping plates are used for graded stripping of polymer particles with different swelling degrees; a stirrer and a cleaner positioned above the stripping plate are arranged in the curing tank, so that blockage is prevented, and dissolution is promoted. Through multi-stage stripping and partition stirring, the device effectively increases the specific surface area of a polymer, accelerates dissolution, reduces fisheye generation, remarkably shortens the curing time, improves the solution uniformity, and is suitable for the mother liquor curing procedure in the polymer flooding oil extraction process.

In water-absorbing resin particle production including a step for mixing polymer particles and an additive in a solid phase state, the present invention provides a water-absorbing resin particle production method with which it is possible to suitably enhance the effect of the additive on water-absorbing resin particles.　This water-absorbing resin particle production method includes: a mixing step for mixing polymer particles and an additive in a solid phase state to obtain a mixture; and a water addition step for adding water to the mixture. The additive has a granular shape. The water solubility of the additive at 25°C is less than or equal to 0.035 g / 100 mL, and the amount of said water added in the water addition step is 0.1-15 parts by mass with respect to 100 parts by mass of the polymer particles.

An improved discontinuous aqueous adhesive coating is disclosed that contains large polymer particles or agglomerates having an average particle size (D50) greater than 5 microns. The coating can be applied to one or both sides of a porous membrane. The method of forming the coating involves applying an aqueous slurry containing large polymer particles having a D50 greater than 5 microns to a porous membrane. The method of application can be a spray method.

The invention relates to the technical field of pressure sensors, and discloses a high-density array pressure distribution sensor formed by stacking multiple layers of functional fabrics. Comprising a pressure sensor main body, and the pressure sensor main body comprises a pressure-sensitive layer which is formed by mixing carbon nanotubes and / or graphene with polymer particles and is of a micro-pyramid or porous foam microstructure; the electrode layer is of an annular buckled net structure, a channel is formed through photo-thermal ablation, the electrode layer comprises an upper electrode layer and a lower electrode layer, and the upper electrode layer and the lower electrode layer are located on the upper side and the lower side of the pressure-sensitive layer respectively; the packaging layer comprises an upper packaging layer and a lower packaging layer, the upper packaging layer and the lower packaging layer are located on the sides, away from each other, of the upper electrode layer and the lower electrode layer respectively, and the upper surface and the lower surface of the pressure-sensitive layer are tightly attached to the whole area of the upper electrode layer and the whole area of the lower electrode layer respectively. According to the technical scheme, the flexibility of the pressure sensor can be improved, and the pressure sensor has wide range and high response.

To provide polymer blend compositions with improved processability and barrier properties, as well as polymer pellets and / or polymer films with improved barrier properties. [Solution] The polymer blend composition according to the exemplary embodiment comprises an ethylene vinyl alcohol-based polymer and an ethylene (meth)acrylic acid-based polymer having a (meth)acrylic acid content of 1% or more and less than 10% by weight. A polymer blend composition with improved processability and barrier properties can be provided. Furthermore, polymer pellets and / or polymer films with improved barrier properties can be provided.

This invention provides a non-fluoropolymer, a non-fluoropolymer composite separator, and their applications. The non-fluoropolymer includes polymer A and polymer B at least partially coating the surface of polymer A. The degree of crosslinking of polymer A is X1, and the degree of crosslinking of polymer B is X2, where 5% ≤ X1 ≤ 10% and 50% ≤ X2 ≤ 60%. The non-fluoropolymer composite separator includes a base film and a coating layer applied to at least one side of the base film. The non-fluoropolymer particles of this invention exhibit a high swelling ratio at high temperatures and also possess reversible electrolyte absorption and release characteristics. When the non-fluoropolymer, non-fluoropolymer composite separator is applied to a battery cell, the non-fluoropolymer swells rapidly when the battery cell experiences abnormal temperature rise, blocking the ion shuttle channels and preventing further temperature deterioration, thus improving the safety performance of the battery cell. Simultaneously, when the temperature returns to normal, the non-fluoropolymer particles can recover their original morphology, restoring the ion shuttle channels, thereby not affecting the subsequent cycle performance of the battery cell.

The invention provides a supported metallocene catalyst, a preparation method of the supported metallocene catalyst, an ethylene homopolymerization reaction method and an ethylene and alpha-olefin copolymerization reaction method. The supported metallocene catalyst comprises a carrier, and a metallocene compound and a cocatalyst which are supported on the carrier, the carrier is selected from silicon dioxide and / or aluminum oxide; the metallocene compound has a structure as shown in a formula I. Formula I. The polymer particles are regular, and the phenomenon that the reactor adheres to the kettle is relieved; in addition, when the supported metallocene catalyst is used for copolymerization of ethylene and alpha-olefin by adopting a slurry polymerization process, the polymerization activity can be improved, the cost is reduced, and the dosage of methylaluminoxane is reduced.

A chemical mechanical polishing pad comprising a polishing portion, the polishing portion comprising: a polymeric body; a plurality of polymeric particles embedded within a bulk of the polymeric body, wherein at least a portion of the plurality of polymeric particles is at least partially exposed to a surface of the polymeric body; and a plurality of pores at the surface of the polymeric body.

Provided is a novel method for producing water-absorbent resin particles having both gel stability with respect to iron-containing artificial urine, gel stability with respect to artificial urine over a long period of time, and yellowing resistance. A method for producing water-absorbent resin particles, the method comprising: a step for obtaining polymer particles by polymerizing a water-soluble ethylenically unsaturated monomer; and a surface crosslinking step for applying a surface crosslinking to the polymer particles, in which a phosphonic acid-based chelating agent is added to the polymer particles having a water content of 5-100 mass% before and / or after the surface crosslinking step, and the phosphonic acid-based chelating agent is added to the polymer particles having a water content of 5-100 mass%. The addition amount of the phosphonic acid-based chelating agent is 0.055-0.6 parts by mass (inclusive) per 100 parts by mass of the water-soluble ethylenically unsaturated monomer.

The invention provides an isolating membrane, a battery monomer and an electric device, the isolating membrane comprises a porous base material and a coating arranged on at least one side of the porous base material, the coating comprises inorganic particles and polymer particles, and the glass transition temperature Tg of the polymer particles is 45-100 DEG C. The isolating membrane is applied to the battery monomer, so that the battery monomer has good cycle performance.

The present invention relates to an aqueous dispersion of polymer particles and its preparation process, to an adhesive composition comprising the aqueous dispersion and to the use of the adhesive composition for adhering a label on a bottle.

The invention relates to the technical field of pressure-sensitive materials, in particular to a wide-range high-response pressure-sensitive material composite structure and a process optimization method. Comprising the following steps: immersing polymer particles into a conductive composite coating solution, mechanically stirring, ultrasonically dispersing, drying and curing to prepare particles with uniformly coated surfaces; the method comprises the following steps: melting particles by adopting a micro-fluidic spinning technology, extruding special-shaped cross-section fibers through a spinneret plate, stretching and shaping, and constructing a surface bulge structure. A plurality of fibers are twisted and stranded, the twisting direction is regulated and controlled to form a stable conductive net, and the periodic wavy linear single-strand pressure-sensitive wire is prepared through thermal mechanical shaping. The pressure-sensitive lines are subjected to warp and weft orthogonal weaving, butt-joint points are locally hot-pressed and fixed to form a latticed synaptic array and groove network, and the tip end is an arc-shaped micro-strain trigger area; and assembling a multi-layer functional fabric stacking structure, preparing an electrode layer, a pressure-sensitive layer and a packaging layer, and sequentially stacking the electrode layer, the pressure-sensitive layer and the packaging layer. According to the technical scheme, the range and response of the sensor in the tower can be improved.

A separator includes a substrate layer, an inorganic coating and a bonding layer. The inorganic coating is disposed between the substrate layer and the bonding layer and includes inorganic particles, the bonding layer includes polymer particles, and at least part of the polymer particles are embedded in pores of the inorganic coating; and in a scanning electron microscope image of a cross section of the separator at a magnification of 2000, within an area of 11.6 μm×7.6 μm, the number of polymer particles embedded in the inorganic coating at a depth greater than or equal to 100 nm is C, and the total number of polymer particles in the cross section is D, where 0.5≤C / D<0.94.